Compressor.



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PATENTED MAY 28,

C. W. DIETRIGH. COMPRESSOR APPLICATION FILED DEC. 15, 1906.

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PATENT OFFICE.

CHARLES W. DIETRIGH, or CHICAGO, ILLINOIS.

COMPRESSOR.

Specification of Letters Patent.

Patented May 28,1907.

Application filed December 15, 1906- blerifll 348,087.

To all iuhmn it may concern.-

Be it known that I, CHARLES W. DIETRICH, a citizen of theiUnited States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Compressors, of which thefollowing is a specification.

My invention relates to an improvement in air or gas compressors, andmore particularly in gas compressors employed in connection with ammoniaice or refrigerating machines for compressing the gas from the coilsinto the condenser, in which the dischargeend of the compressor-cylinderis closed by a spring-pressed valve of the full area of thatcylinder-end, against which it seats, to be unseated by thecompression-stroke oi the piston.

My object is to provide a novel and improved construction, in matters ofdetail, of a compressor in the class referred to, and my inventionconsists in the particular details of construction hereinafter describedand claimed, andillustrated in the accompanying drawing, in which-Figure 1 is a'broken view in vertical sectional elevation of an air orgas compressor which is bolted to the upper end of the casingciprocating it.

3, has formed about its interior an annular series of Z-shapedinwardly-projecting ribs 9, the upper, vertical sections of which arewithin the cap-portion of the head, from the upper end of which adischarge-pipe 11 leads to a condenser (not shown). Within the casing 3is housed the compressor-cylinder 12, forming with the casing (which maycontain a plurality of cylinders) a circumferential gas-chamber 13, intowhich leads a gas-inlet pipe 14 from the ammonia-coils (not shown), andfrom which a circumferential series of ports 15 lead into the cylinderthrough its wall aoove the upper end of a piston 16 when at the lowerend of its stroke.

.The stem 1.7 of the piston works through thr.

stalling-box 5 on the base 4, (which is also the cylinder-base) and isconnected with any suitable driving-power (not shown) for re- On theupper discharge-end of the cylinder .12 is seated a disk-valve 18 havingan upper sleeve-extension 19, about its center, provided with series ofports at intervals about its circumference and closely fitting, forguidance, about the sections of the ribs 9 which extend part way ,-intothe gas-chamber 10 within the 10. A spring 21 is confined in thesleeve-extension 19 between the valve and 'the upper end of the cap, totend to seat the valve. The diskvalve fits accurately within the lowersections of the annular series of ribs, the horizontal sections of whichlimit the upward movement of the valve to reduce its play to theminin'uun.

\Vhen the piston is at the end of its downstroke, gas from thechamber13, which is continuously supplied through the-pipe 14, enters thecylinder through the ports 15 ahead of the piston, the upstroke ofwhich. compresses the gas against the valve 18 and opens the latter,permitting free and quick discharge of the gas past the valve, betweenthe ribs 9 and through the ports 20 into the chamer 10*, whence itdischarges through the pipe 11. The upstroke of the piston carries itslightly beyond the discharge-end of the cylinder to insure completeevacuation oi the gas in the latter.

In the type of compressor to which my improvement relates it is ofimportance that the valve shall seat with accuracy at the beginning ol'the downstroke of the iston, under the force of the spring 21 and thebackpressure from the condenser. This accuracy is attained by thedescribed sleeve-guiding Y rih-consl'ruction, which, as organized,avoids impediment to the desirable free discharge of gas from thecylinder, besides rendering the construction of the guiding meansparticularly durable. Moreover, the lower sections of the ribs enhancethe true-seating action of the valve while the stoppage of its upwardmovement bythe horizontal rib-sections, reduces wear on the valve whichwould result from an undue extent of play thereof.

That I claim as new and desire to secure by Letters Patent is- 1. In acompressorof the character described, the combination of a cylinder cominunicatiug with the gas-sup ly and containing a reciprocating piston, acad on the cylinder containing a gas-chamber provided with adischarge-outlet, a circumferential series of Z-shaped ribs in saidchamber, and

a spring-pressed valve seating against the a spring-pressed valveseating against the discharge-end of the cylinder in said chamberguidingly within the lower sections of said series of ribs to co-operatewith the horizontal sections thereof, and provided with asleeveextension having ports and fitting series.

CHARLES W. DIETRICH.

In the presence o'f \V. B. DAVIEs, C. W. \NAsnnURNE.

guidingly within the upper sections of said 20

